Daikin-McQuay B1370187 130-160F Auto Primary Limit Switch for Gas Furnaces

The Daikin-McQuay B1370187 is an OEM auto-reset primary limit switch engineered to protect gas furnaces from dangerous overheating conditions. This critical safety component continuously monitors internal plenum temperatures and interrupts the heating cycle when airflow becomes restricted due to a clogged filter, a failing blower motor, or other system faults.

Key Features:

• Cut-Out Temperature: Opens at 160°F to shut down the burner on high-limit events
• Cut-In (Reset) Temperature: Automatically resets and closes the circuit at 130°F once safe temperatures are restored
• Auto-Reset Design: Minimizes system downtime by automatically restoring the circuit without manual intervention
• Button-Style Form Factor: Compact button shape for straightforward installation in furnace plenum applications
• Heavy-Duty Construction: Pressed steel enclosure with 3-inch probe for precise thermal sensing and durability through repeated expansion cycles
• OEM Part: Genuine replacement part meeting factory specifications for seamless integration with integrated ignition control boards

Cross-Reference Part Numbers: PRIM LMT SWCH 160F, 314368, 60T81, A2044, L160-30F

This primary thermal limit switch is a direct-fit OEM replacement compatible with Goodman, Amana, Daikin, Janitrol, Kenmore, McQuay, Xenon, GMC, and Gree furnace equipment. It resolves common "Limit Switch Open" diagnostic fault codes and rapid system cycling issues. Always verify the part number on the existing switch before ordering.